The lower crosspiece which will hold the shower valve may be around 50 inches from the floor for a shower enclosure and lower for a bathtub just enough to clear the lip of the tub by a few.
Shower valve distance from floor.
For shower only controls between 36 and 48 inches from the floor is common.
The valve height depends on if it is a tub and shower combo or just a shower.
A height of 28 inches or 2 feet 4 inches is standard for valves in bathtub shower units.
This is shown as the distance from the finished wall surface to the center of the riser pipe the pipe that goes from the shower valve up to the shower head.
Showers set in bathtubs require lower valve heights because the valve must connect to both the shower and the bath tap.
About 33 inches from the floor.
For a tub you would want it low enough to reach without standing up but still high enough to reach without bending over when taking a shower.
Shower heads are located at a standard height of 80 203 cm but can be set at a minimum height of 72 183 cm if desired.
Shower controls should be placed at a height 40 50 102 127 cm above the shower floor and out of direct line of the water path to avoid being caught in extremely cold or hot water when operating.
The height of the valve for a shower depends upon whether you need it for a shower stall or a shower set in a bathtub.
Subtract the thickness of your finished wall from the depth distance to find the pipe depth.